/*
 *NAME:MESA_handle_logger
 *INTRODUCTION:Based on logger and thread_safe, provide runtime_log function with independent handle for different users.
 *Author:yangwei@iie.ac.cn
 *History:
		2014-03-24 created by yw
		1)第一个动态库版本
		
		2014-04-16 modified by yw
		1) 支持g++ 4.4.4编译
		
		2014-05-29 update by yw
		1)支持创建用户指定的日志目录

		2019-2-18 update by yw
		1)性能优化，句柄中存储文件fp，定期flush至文件
------------------------------------------------------------------------------------- 		
 NOTICE:
		1)compatible with g++, extern with c;
 		2)thread_safe IS supported;
		3)DO destroy handle process before exit.
		4)demo requires lpthread support
*/